[ncl-talk] Regarding the calculation of heights

[Prashanth Bhalachandran]

Sorry for reposting, can someone help me with this please? 
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Dear NCL'ers, 
As we know WRF's outputs are originally in Eta coordinates. I am trying to understand the logic of how the height (z) is calculated in NCL's wrfusergetvar function. 

 z  = wrf_user_getvar(a, "z",time)        ; grid point height
I expect that the height at each eta level should change as a function of x,y, and time. 
Can someone tell me how the above function calculates this z? Is there an hydrostatic assumption? In other words, is the z 
just geopotential height? Or is it the actual height itself? 

Thank you, 
Prashanth 

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